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Trophic interactions in the coastal ecosystem of Sri Lanka: An ECOPATH preliminary approach

机译：斯里兰卡沿海生态系统中的营养相互作用：ECOPATH初步方法

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摘要

This study attempts to assemble and summarize existing information in order to build a general representation of the trophic interactions within the shallow coastal ecosystem of Sri Lanka. A multispecific ecosystem-based approach on trophic relationships and their possible variations was performed using ECOPATH. Thirty-nine functional groups were considered representing all trophic levels in the food web. Time-dynamic simulation was carried out using the ECOSIM routine to evaluate the impact of the 1998 El Nino event on key functional groups. Results show that the time needed for any impacted functional group to recover to its initial abundance increased with the trophic level. Two time-series data sets derived from commercial catch and effort statistics were used for validation of ECOSIM results. The El Nino simulation results validated by the time-series data confirmed the ability of the proposed multispecies model to describe the sudden environmental changes. Possible impacts due to increase of fishing effort were also simulated by separately considering frequently used fishing gears. The analysis revealed that small-mesh gillnet fishery operates independently from the other existing developing fisheries in the same area and can be managed accordingly. Fishing-effort simulations suggest that the increase of fishing intensity by small-mesh gillnets would contribute to the decline of small pelagic catch. This was also found to influence the overall catch. The present level of exploitation of small pelagic fishery resources does not seem sustainable.
机译：本研究试图汇总和总结现有信息，以建立斯里兰卡浅海沿海生态系统内营养相互作用的一般表示。使用ECOPATH对营养关系及其可能的变化进行了基于多生态系统的方法。考虑到39个功能组代表食物网中的所有营养水平。使用ECOSIM例程进行时间动态模拟，以评估1998年El Nino事件对关键功能组的影响。结果表明，随着营养水平的提高，任何受影响的官能团恢复至其初始丰度所需的时间都会增加。从商业捕捞量和工作量统计中得出的两个时间序列数据集用于验证ECOSIM结果。时间序列数据验证了厄尔尼诺现象的仿真结果，证实了所提出的多物种模型能够描述突然的环境变化。通过分别考虑经常使用的渔具，还模拟了由于增加捕捞努力而可能造成的影响。分析表明，小网状刺网渔业的运作独立于同一地区的其他现有发展中渔业，因此可以进行相应管理。捕捞努力的模拟表明，小网状刺网增加捕捞强度将有助于减少中上层小渔获量。还发现这会影响总产量。目前小型中上层渔业资源的开发水平似乎无法持续。

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